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Unable to use AdministrationService

and at first I get the response: "no SOAPAction header!" , then I try to set a header to an empty string because of what it is written in the wsdl file: ""

but then I get this:
soapenv:Server.userExceptionorg.xml.sax.SAXParseException; lineNumber: 4; columnNumber: 62; The prefix "xsi" for attribute "xsi:type" associated with an element type "in0" is not bound.